Your friend asks you goto his home to attend a birthday party at 6:00 in the afternoon.you'd better get there at?

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• Your friend asks you goto his home to attend a birthday party at 6:00 in the afternoon.you'd better get there at?
• Your friend asks you goto his home to attend a birthday party at 6:00 in the afternoon.you'd better get there at?
• 在直角坐标系xoy中 直线l的参数方程为x=3-√3/2t,y＝1／2t,﹙t为参数﹚,以O为极点,x轴的正半轴为极轴的坐标系中,曲线C的方程为ρ＝2acosθ﹙a＞0﹚,l与C相切于点P.求切点P的极坐标.
• 已知直线l的参数方程：x=t y=1+2t（t为参数）和圆C的极坐标方程：ρ=2倍根号2sin(θ+ π 4 )． 已...已知直线l的参数方程：x=t y=1+2t（t为参数）和圆C的极坐标方程：ρ=2倍根号2sin(θ+ π 4 )．已知直线l的参数方程：x=ty=1+2t（t为参数）和圆C的极坐标方程：ρ=22sin(θ+π4)．判断直线l和圆C的位置关系．